# All files / src/providers/anthropic Utils.ts

92.98% Statements 53/57
73.43% Branches 47/64
100% Functions 5/5
94.64% Lines 53/56

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     import { Message } from "../../chat/Message.js";
    import { ContentPart } from "../../chat/Content.js";
    import { AnthropicMessage, AnthropicContentBlock } from "./types.js";

    export function formatSystemPrompt(messages: Message[]): string | undefined {
      let systemPrompt: string | undefined;
      for (const msg of messages) {
        if (msg.role === "system" || msg.role === "developer") {
          if (typeof msg.content === "string") {
            systemPrompt = msg.content;
          } else if (Array.isArray(msg.content)) {
            systemPrompt = msg.content
              .filter((p): p is ContentPart & { type: "text" } => p.type === "text")
              .map((p) => p.text)
              .join("\n");
          E} else if (msg.content) {
            systemPrompt = String(msg.content);
          }
        }
      }
      return systemPrompt;
    }

    export function formatMessages(requestMessages: Message[]): AnthropicMessage[] {
      const messages: AnthropicMessage[] = [];

      for (const msg of requestMessages) {
        Iif (msg.role === "system" || msg.role === "developer") continue;

        const formatted = formatSingleMessage(msg);
        const lastMsg = messages[messages.length - 1];

        if (lastMsg && lastMsg.role === formatted.role) {
          // Merge content
          const existingContent = Array.isArray(lastMsg.content)
            ? lastMsg.content
            : [{ type: "text", text: lastMsg.content } as AnthropicContentBlock];

          const newContent = Array.isArray(formatted.content)
            ? formatted.content
            : [{ type: "text", text: formatted.content } as AnthropicContentBlock];

          lastMsg.content = [...existingContent, ...newContent];
        } else {
          messages.push(formatted);
        }
      }
      return messages;
    }

    function formatSingleMessage(msg: Message): AnthropicMessage {
      const role: "user" | "assistant" = msg.role === "user" ? "user" : "assistant";

      // Handle Tool Responses (role: "tool")
      if (msg.role === "tool") {
        return {
          role: "user",
          content: [
            {
              type: "tool_result",
              tool_use_id: msg.tool_call_id!,
              content: typeof msg.content === "string" ? msg.content : JSON.stringify(msg.content),
              is_error: msg.isError
            }
          ]
        };
      }

      // Handle Assistant Messages (which might have tool_calls)
      if (msg.role === "assistant" && msg.tool_calls) {
        const blocks: AnthropicContentBlock[] = [];

        // Assistant text content
        const text = String(msg.content || "");
        Eif (text.length > 0) {
          blocks.push({ type: "text", text });
        }

        // Assistant tool uses
        for (const toolCall of msg.tool_calls) {
          blocks.push({
            type: "tool_use",
            id: toolCall.id,
            name: toolCall.function.name,
            input: JSON.parse(toolCall.function.arguments)
          });
        }
        return { role: "assistant", content: blocks };
      }

      const contentText = String(msg.content || "");

      if (contentText && typeof msg.content === "string") {
        return { role, content: contentText };
      }

      Iif (contentText && msg.content instanceof String) {
        return { role, content: contentText };
      }

      // Handle multimodal content (images)
      const blocks: AnthropicContentBlock[] = [];
      Eif (Array.isArray(msg.content)) {
        for (const part of msg.content) {
          if (part.type === "text") {
            blocks.push({ type: "text", text: part.text });
          E} else if (part.type === "image_url") {
            const url = part.image_url.url;
            Eif (url.startsWith("data:")) {
              const parts = url.split(",");
              const meta = parts[0];
              const data = parts.slice(1).join(",");

              Eif (meta && data) {
                const mimeMatch = meta.match(/:(.*?);/);
                const mediaType = mimeMatch ? mimeMatch[1] : "image/jpeg";

                if (mediaType === "application/pdf") {
                  blocks.push({
                    type: "document",
                    source: {
                      type: "base64",
                      media_type: "application/pdf",
                      data: data
                    }
                  });
                } else {
                  blocks.push({
                    type: "image",
                    source: {
                      type: "base64",
                      media_type: mediaType || "image/jpeg",
                      data: data
                    }
                  });
                }
              }
            }
          }
        }
      }
      return { role, content: blocks };
    }